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  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
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<body>
  <script>
    //1.类的集成
    // class Father{
    //   constructor(){

    //   }
    //   money(){
    //     console.log(100);

    //   }
    // }
    // class Son extends Father {

    // }
    // var son = new Son();
    // son.money();
    class Father{
      constructor (x,y){
        this.x = x;
        this.y = y;
      }
      sum(){
        console.log(this.x + this.y);

      }
    }
    class Son extends Father {
      constructor(x,y){
        super(x,y);//调用了父类中的构造函数
      }
    }
    var son = new Son(1,2);
    var son1 = new Son(11,22);
    son.sum();
    son1.sum();
  </script>
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